Ron , we have the exact same problem. Cap is loose, I tried putting more gasket in it with no success. I even put a safety wire on it in case it popped off, it never did. I noticed the end piece on the neck is shorter than the original.
bill v
69 Firebird Convertible (wifes car since 1979) Goldenrod Yellow, 350, plain Jane Car was stored in garage since 1990
I need help, if anyone see's I'm going down the wrong road--Straighten me out!